-75.6% is the change from 668 to 163
Calculation steps:
[( 163 - 668 ) ÷ 668] x 100 = -75.6%
Formula
Percentage change = [(163 - 668) / 668] x 100
Subtract the new number by the original number
163 - 668 = -505
-505 ÷ 668 = -0.7559880239520959
-0.7559880239520959 x 100 = -75.6%